This isn't the place I saw it last time. I had a schematic that needed some very expensive microwave devices. I never build one as it would have cost a lot.

http://www.tsc-global.com/index1.htm

Whether his will work or not is not something I know. There are two kinds of speed detecting radars. Pulse and continuous wave, I think that pulse is all that's around now but do not know for sure. The jammers were meant for pulse systems.